Abstract

RIVERA-JIMENEZ, Hernando Javier et al. Genetic diversity intra and inter-specific yam (Dioscorea spp.) from the colombian caribbean region by AFLP markers. Acta Agron. [online]. 2011, vol.60, n.4, pp.328-338. ISSN 0120-2812.

Knowing the genetic variability of yams, Dioscorea spp., is a good tool to support development and conservation strategies of this plant as genetic resource. The aim of this study was to carried out the molecular characterization of 20 accessions of Dioscorea spp. using the AFLP molecular technique to determine how genetic variation is distributed intra-and inter-specifically. Using multiple correspondence analysis and level of reliability of the genetic groups by resampling, the results showed high genetic variability among the accessions studied giving as a result four genetic groups: D. alata L., D. rotundata Poir., D. esculenta (Lour.) Burkill and D. trifida L.f., which confirmed a correspondence between the morphological and molecular characterization. The average values of similarity ranged from 41.81% in D. alata and D. rotundata, and 33.51% in D. trifida and D. esculenta. These data are consistent with previous morphological characterizations and systematics of the species in relation to their botanical sections. The analysis also revealed the heterogeneous composition of D. alata in the colombian Caribbean region; these studies will help to define an appropriate strategy for conservation to support future efforts in breeding programs.

Keywords : Agronomy characters; colombian Caribbean region; Dioscorea spp; genetic marker; molecular characterization; plant genetic resources.

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